That's not the same: quadratic equations are not necessary in a calculator app, while a not easily closable PIN panel is necessary in every (serious and advertised as serious) security app.

You can continue your joking, but I don't think many of you will seriously use that app knowing the security bug.

I would use it, if there were no bugs.

Edit: I'm not criticizing all the apps, please read more carefully my posts. I'm criticizing THIS app. Btw if I didn't find maemo.org apps usefull, I wouldn't be the first tester in Extras-Testing charts.